Dude where's my PFE?

Version Store 624 events

Applies to Exchange 2000, Exchange 2003, Exchange 2007. So in Version Store 623 errors, Version Store gets 'clogged', if you will, and will fail to process transactions. 624 errors on the other hand, are caused by a lack of available virtual memory on

Avoiding Version Store problems in the enterprise environment

Applies to Exchange 2003 So one of the things that can go wrong with Exchange is that it can run out of something called Version Store. Version store is an in-memory list of changes made to the database. Nagesh Mahadev has an awesome post about Version